John Mooner, from Newton Abbott, Devon, is a UFO investigator who regularly watches the skies above the south west, and manages the website worldufophotos.org.
He has now handed over four of his most perplexing photographs to top UFO investigators based in the US.
Mr Mooner snapped three of the images in 2016, and one in 2015, and they have now been sent to the Mutual UFO Network (MUFON), which keeps a global database of such sightings, for further analysis.
One picture, taken above Newton Abbott on September 13 2016, shows a flying saucer shaped object that “emerged from some clouds” according to Mr Mooner.
In a report to MUFON, he said: “I was sky watching when I spotted a flying saucer that had just emerged from some clouds.
“The flying saucer was just hanging there in the sky. It was like the aliens in the flying saucer wanted me to take a photograph.
“I managed to take one photograph before the UFO went back into the clouds away from sight.”
On April 19 last year he says he snapped “a black object far off in the distance”.
He said it was “jet black and had an almond shaped light on the front.”
He said: “The almond-shaped light had a yellowish tinge to it.
“Also there was smoke that came out of the back of the object as it moved. The smoke was in small bursts.”
He said it “sped off into the distance at incredible rate off speed.”
Just two months later on June 26 at 1.20am, he said he saw out of the kitchen window “a strange bright object hanging above a nearby housing estate”.
He said: “The object was definitely not any type of known aircraft.
“It was glowing bright orange and had a white pulsing light on the top left side.”
He said it just hung silently over the housing estate, adding: “A tube began to extend from the middle of the object and when it was fully extended it glowed with a yellowish tinge.”
I was sky watching when I spotted a flying saucer that had just emerged from some clouds.
The final image he submitted to MUFON was of what he described as a UFO touching a plane taken on September 21 2014.
He wrote: “I noticed a flying saucer fly up to the back of the passenger plane and make physical contact with the tail section.
“The flying saucer then gave the plane a nudge before flying off at an incredible rate of speed.
“The pilot must of felt the nudge and probably thought it was air turbulence.
“The flying saucer had a dome on the top and had a light on the bottom. It definitely looks like a classic flying saucer.
Scott Brando is a sceptical UFO investigator who runs the hoax-busting website ufoofinterest.org.
He does not believe that there have yet been any photographs or videos of alleged UFOs taken that can not be explained.
He said if Mr Mooner was looking south west at the time of the incident on June 26 last year, then he probably just photographed Mars, as planets tend to distort when a lens is zoomed at them.
However, he was left stumped by the remaining three images.
He told Express.co.uk: “About other pictures reported to Mufon several times by the same witness, it’s very hard to understand what the objects could be.
“At the moment I’m not able to make hypotheses.”